Year	Number of
1990	511.66
1991	577.15
1992	740.79
1993	973.18
1994	1340.9
1995	1903.44
1996	2647.32
1997	3574.64
1998	4030.83
1999	4053.1
2000	3943.04
2001	3747.75
2002	3502.01
2003	3228.07
2004	2573.83
2005	2615.02
2006	3322.89
2007	3687.5
2008	3994.99
2009	4258.65
2010	4502.45
2011	4632.61
2012	4772.67
2013	4889.21
2014	5027.82
2015	5183.03
2016	5325.44